Enrichment of extremophilic exoelectrogens in microbial electrolysis cells using Red Sea brine pools as inocula
AuthorsChehab, Noura A.
Ortiz Medina, Juan F.
Rao, Hari Ananda
Amy, Gary L.
Logan, Bruce E.
KAUST DepartmentBiological and Environmental Sciences and Engineering (BESE) Division
Environmental Science and Engineering Program
Water Desalination and Reuse Research Center (WDRC)
KAUST Grant NumberFCC/1/1971-05-01
Online Publication Date2017-05-03
Print Publication Date2017-09
Permanent link to this recordhttp://hdl.handle.net/10754/623408
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AbstractApplying microbial electrochemical technologies for the treatment of highly saline or thermophilic solutions is challenging due to the lack of proper inocula to enrich for efficient exoelectrogens. Brine pools from three different locations (Valdivia, Atlantis II and Kebrit) in the Red Sea were investigated as potential inocula sources for enriching exoelectrogens in microbial electrolysis cells (MECs) under thermophilic (70°C) and hypersaline (25% salinity) conditions. Of these, only the Valdivia brine pool produced high and consistent current 6.8 ± 2.1 A/m2-anode in MECs operated at a set anode potential of +0.2 V vs. Ag/AgCl (+0.405 V vs. standard hydrogen electrode). These results show that exoelectrogens are present in these extreme environments and can be used to startup MEC under thermophilic and hypersaline conditions. Bacteroides was enriched on the anode of the Valdivia MEC, but it was not detected in the open circuit voltage reactor seeded with the Valdivia brine pool.
CitationShehab NA, Ortiz-Madina JF, Katuri K, Hari AR, Amy G, et al. (2017) Enrichment of extremophilic exoelectrogens in microbial electrolysis cells using Red Sea brine pools as inocula. Bioresource Technology. Available: http://dx.doi.org/10.1016/j.biortech.2017.04.122.
SponsorsThis work was sponsored Center Competitive Funding Program (FCC/1/1971-05-01) to P.E.S. from King Abdullah University of Science and Technology (KAUST).